Manual J

Hello everybody. I was wondering if someone could tell me how to do a Manual J load calculation. I am in the process of remodeling a workshop and turning it into a rental apartment. I want to make sure that what I do is right. I have talked with a few older HVAC techs and a few younger ones. Some say do the manual J, some say just go with the sq footage. I dont know what im doing but I dont want some idiot coming in and two years from now I have to redo something. I thank you all for your help. If its just the square footage, its 1532 sq ft.

IMO if you're remodelling a workshop you need to consider the heat gain/loss of the shop, the usage patterns, machinery, number of people, etc etc - in other words, you couldn't really go by the standard rules of thumb (600 sft/ton residential, 400 commercial).

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IMO if you're remodelling a workshop you need to consider the heat gain/loss of the shop, the usage patterns, machinery, number of people, etc etc - in other words, you couldn't really go by the standard rules of thumb (600 sft/ton residential, 400 commercial).

Manual J

Thank you for your quick replies. I checked out the website and im going to download it soon as the paycheck gets deposited. Funny how that works. Anyway would it be worth it to do a Manual D calculation as well? Also, this may be opening a can of worms, but would it be worth it to go ductless rather than ducted? I have seen some units with SEER ratings as high as 20-24 in the ductless, but about 17 is as high as ive seen with ducted? Any opinions?